EP2521241B1 - Feldgerät mit einer Ladestromregelungsvorrichtung - Google Patents

Feldgerät mit einer Ladestromregelungsvorrichtung Download PDF

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Publication number
EP2521241B1
EP2521241B1 EP11164940.6A EP11164940A EP2521241B1 EP 2521241 B1 EP2521241 B1 EP 2521241B1 EP 11164940 A EP11164940 A EP 11164940A EP 2521241 B1 EP2521241 B1 EP 2521241B1
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EP
European Patent Office
Prior art keywords
current
field device
charging
input
switching regulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11164940.6A
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German (de)
English (en)
French (fr)
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EP2521241A1 (de
Inventor
Andreas Isenmann
Volker Allgaier
Karl Griessbaum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vega Grieshaber KG
Original Assignee
Vega Grieshaber KG
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Filing date
Publication date
Application filed by Vega Grieshaber KG filed Critical Vega Grieshaber KG
Priority to EP11164940.6A priority Critical patent/EP2521241B1/de
Priority to US13/454,633 priority patent/US8928285B2/en
Priority to CN201210139229.4A priority patent/CN102810887B/zh
Publication of EP2521241A1 publication Critical patent/EP2521241A1/de
Application granted granted Critical
Publication of EP2521241B1 publication Critical patent/EP2521241B1/de
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply

Definitions

  • the invention relates to the power supply of field devices.
  • the invention relates to a field device with a charging current control device for controlling an input current of the field device and for controlling a charging current for charging an energy storage device for the field device.
  • Field devices are used, for example, in measurement and automation technology.
  • field devices may have an energy store, which allows the operation of the field device independently of a power supply via a power grid.
  • the energy store may be, for example, rechargeable batteries.
  • the energy store may be rechargeable batteries which are charged via a power network during operation of the field device.
  • US 2005/0017693 A1 describes a power supply unit for a mobile computer for providing power for operating the computer and charging a battery, wherein the power requirements for operating the computer and charging the battery may vary.
  • EP 2 202 598 A2 describes a field device with an input circuit and a power management electronics, which is designed to load an energy target level exceeding electrical energy amount of the voltage applied to the input circuit electric power supply in a memory for electrical energy. This field device corresponds to the preamble of claim 1.
  • input protection circuit In field devices, the possibility of the input current load is limited, z. B. by protective circuits for measures for electromagnetic compatibility or by polarity reversal circuits (hereinafter referred to as input protection circuit).
  • a field device is provided with a charging current regulating device for charging an energy store for the field device and for regulating a charging current for the energy store, which has a control unit, a control unit and a switching regulator.
  • the input current depends on the input voltage and the output power. With increasing input voltage and constant output power of a switching regulator, the input current, which is used to charge the energy storage decreases without control.
  • the output power of the switching regulator of which the charging time of the energy storage depends, be increased, which in turn leads to increased power consumption of the field device, so that the input protection circuit of the field device is busy.
  • the components in the input protection circuit must be designed for the maximum load case. For a given output power of a
  • Switching regulator for a charging circuit this is the case with a small input voltage, because in return a high input current is necessary to achieve the predetermined output power.
  • the input current of a switching regulator for charging rechargeable batteries decreases with increasing input voltage and constant output power.
  • an input protection circuit In the high input voltage range, which means a low input current at a given output power, an input protection circuit is not fully utilized, so that a rechargeable energy storage to be charged, such as rechargeable batteries, is not charged as quickly as possible.
  • the control unit is used to specify a reference variable for the control unit.
  • the reference variable may be, for example, a maximum permissible input current for an input protective circuit of the field device.
  • the control unit can be configured manually or automatically, for example, by adjusting the reference variable as a function of external parameters, such as an ambient temperature of the field device.
  • the control unit can be set up to regulate the input current of the switching regulator for charging the energy store by means of a control variable is transmitted to the switching regulator by the control unit.
  • control unit can also be set up to transmit a manipulated variable to an electrical load of the field device so that the electrical load reduces its current consumption, which in turn reduces the input current of the field device, so that an input protective circuit of the field device is not overloaded or remains constant Input current of the charging current can be increased.
  • the switching regulator may specify an input voltage and an input current for a charging circuit, which performs a charging process of the energy storage device of the field device.
  • the input current of the electrical load and the input current of the switching regulator for charging the energy storage specify the total input current of the field device, which flows through the input protection circuit of the field device.
  • the input current of the field device can be controlled by the fact that the control unit adjusts the input current of the switching regulator or the input current of the electrical load.
  • control unit for the control unit can be specified whether and in what way the input current of the electrical load and / or the input current of the switching regulator for charging the energy storage is to be adjusted.
  • a field device with a charging current control device for charging an energy storage device for the field device and for regulating a charging current for the energy storage, without in this case a limit value for an input current of the field device, is specified.
  • the charging current control device has a current sensing resistor, an operational amplifier and a switching regulator.
  • the input current of the field device can flow, as a result of which a corresponding voltage drops across the current sensing resistor.
  • the voltage dropping across the current sensing resistor can be used as input to the operational amplifier.
  • an output value of the operational amplifier can be passed to the switching regulator, so that a recording current or an output current of the switching regulator can be changed.
  • the switching regulator is controlled by the operational amplifier so that the recording current or the output current of the switching regulator is changed so that the input current of the field device, which flows through the current sensing resistor does not exceed the limit value of the input current of the field device.
  • the input current of the field device or the recording current or the output current of the switching regulator represent the variable to be controlled, thus the controlled variable.
  • the operational amplifier in conjunction with the current sensing resistor is a controller or a control unit.
  • the control variable of the controller is the limit value of the input current of the field device.
  • the actual value of the input current of the field device is determined indirectly via a falling voltage across the current sensing resistor, wherein the voltage dropping across the current sensing resistor is caused by the input current of the field device flowing through the current sensing resistor.
  • an output signal is produced at the operational amplifier, which can serve as a control variable for the current consumption of the switching regulator, so that results from an adjustment of the recording current or the output current of the switching regulator, an adjustment of the input current of the field device.
  • An output value of the operational amplifier can of course also be routed to an electrical load of a field device, so that an input current of the electrical load is regulated, whereby the input current of the field device is also adjusted.
  • a control unit may be connected to the operational amplifier such that a desired value for the input current of the field device is specified.
  • the operational amplifier is connected as a differential amplifier, so that a voltage difference applied to two inputs of the operational amplifier is provided with an amplification factor at an output of the operational amplifier.
  • the difference between a desired value for the input current of the field device and the actually measured value of the input current of the field device causes the output value of the operational amplifier, which serves as a manipulated variable for the current consumption of the switching regulator and / or the electrical load of the field device.
  • the current sensing resistor is an ohmic resistor.
  • a charge current control device as described above and below is particularly suitable for use in field devices, which are operated with direct current and in a GIcichspanmmgsbcreich particular 12 volts, 24 volts or 32 volts.
  • a field device which has a charging current control device as described above and below.
  • the field device further comprises an input protection circuit, an energy store, at least one electrical load and a charging circuit.
  • the input protective circuit represents a limiting factor for an input current load of the field device. In other words, an excessive input current load can lead to damage of the input protective circuit.
  • the energy storage is designed to provide the electrical load with electrical energy.
  • the charging circuit is designed to supply the energy store with energy such that the energy store stores the supplied energy, wherein the charging current regulating device controls the charging current supplied to the charging circuit.
  • the input protection circuit can be, for example, measures for electromagnetic compatibility or measures for polarity reversal protection.
  • any component can be used which is suitable to store electrical energy, in particular in chemical form.
  • the energy storage is used to provide energy to operate the field device away from the accessibility of a power grid or in the event of a power failure.
  • the at least one electrical load of the field device may be, for example, a measuring device or an evaluation device for data acquired by a measuring device.
  • the measuring device may be a fill level sensor, a pressure sensor or a flow sensor.
  • sensors for any physical quantities in a field device as described above and described below may be included.
  • the electrical load can also be an evaluation unit which receives and processes a series of detected values with at least one measured value, for example for transmission to another one Prepare evaluation unit, but can also prepare the values for later processing.
  • the field device may also contain a large number of electrical consumers, for example a large number of sensors and / or, for example, a plurality of evaluation units.
  • the charging circuit is designed to be supplied with energy by the switching regulator of the charging current control device in such a way that the energy store connected to the charging circuit is charged.
  • the charge current control device regulates the charging current of the charging circuit and the current consumption of the at least one electrical load so that a maximum allowable load of the input protection circuit is not exceeded and the energy storage is still loaded as quickly as possible.
  • a charge current control device as described above and below allows the energy store to be charged as quickly as possible, since the charging current can be regulated as a function of the current consumed by the at least one electrical load, so that the maximum current supply capacity of the field device is always utilized taking into account the maximum load of the input protective circuit can.
  • the energy store is a unit of rechargeable batteries.
  • the unit of rechargeable batteries may have at least one rechargeable battery, but also a plurality of rechargeable batteries.
  • the electrical load of the field device is a level gauge.
  • the electrical load of the field device is a flow meter.
  • the electrical load of the field device is a pressure gauge.
  • the field device may also have an associated evaluation unit in addition to the measuring devices.
  • a plurality of measuring devices including for different physical quantities, may be included.
  • the evaluation units can receive the measured values from the measuring devices via wireless or wired data transmission.
  • the evaluation devices can also transmit processed data from the measured values wirelessly or by wire to further evaluation units.
  • a power consumption of the electrical load can be changed so that the charging current for the energy storage unit and thus the input current of the feeder can follow a predetermined value.
  • the current consumption of the electrical load can be regulated as a function of an ambient temperature, an input voltage or other external physical variables as well as in dependence of the charge state of the energy store.
  • the control of the current consumption of the electrical load can be done, for example, by a control unit prioritizing the charging of the energy storage via the control unit makes.
  • the predefinable value for the charging current of the energy store can be kept constant.
  • the power consumption of the electrical load by the control unit is also kept constant, insofar as the sum of the charging current and the current consumption of the electrical load corresponds to the maximum input current of the field device via the input protection circuit.
  • both the charging current for the energy storage and the current consumption of the electrical load can be controlled so that the sum of the charging current and the current consumption of the electrical load only corresponds to a portion of the maximum input current of the field device.
  • the control unit for controlling the charging current and the current consumption of the electrical consumer external parameters such as the ambient temperature, zoom.
  • the maximum load of the input protective circuit can vary with an input current and the recording of the charging current is controlled such that the size of the charging current value follows a varying input current value.
  • a method for controlling a charging current which detects an input current of a field device in a first step and regulates a charging current in a second step, so that the Sum of the charging current and a current consumption of an electrical load does not exceed a predetermined value for the input current.
  • the method further comprises the step of regulating the current consumption of an electrical consumer.
  • both the charging current and the current consumption of the electrical load can be regulated individually and / or jointly.
  • a charge current control device as described above and below for charging an energy store for a field device measures the input current of the field device and regulates, for example, the charging current for the energy store according to the measured input current at a clocked charging circuit. With constant output power of the charging circuit and increasing input voltage to the charging circuit would result in a sinking charging current, which led to a sinking input current of the field device.
  • the charge current control device detects the drop in the input current of the field device and controls the charging circuit for the energy storage so that the charging current and thus the input current of the field device increase. In this way, an input protection circuit of the field device can be loaded, for example, with a constant input current, or even utilized to the maximum.
  • the charging current control device as described above and below can also be used to dimension input protection circuits for smaller input currents, since the charging current control device can be designed not only to increase the charging current but also to limit it to a predefinable maximum value. A rapid charging of the energy storage device of the field device is still possible, since the charge current control device as described above and below, is suitable, any current difference between the actual current consumption of an electrical load of the field device and the maximum possible input current of the field device to be used as a charging current for the energy storage.
  • Fig. 1 shows a field device 10 according to an embodiment of the invention.
  • the field device 10 has a charging current control device 100, an input protection circuit 101, an energy storage 105 and an electrical load 106.
  • the charging current control device 100 has a control unit 102, a control unit 103 and a switching regulator 104.
  • the field device 10 is supplied with the voltage U E and the current I E via the input protection circuit 101.
  • the control unit 102 receives from the control unit 103 is a command variable, namely the setpoint of the input current I E , and can act via a control variable to the switching regulator 104 or the electrical load 106 so that either the switching regulator 104 is a recording current I L or an output current I A or the electrical load 106 changes a current consumption I V.
  • the output current I A of the switching regulator 104 corresponds to the charging current for the energy storage 105.
  • the control unit 102 may be designed so that it outputs a manipulated variable to the switching regulator 104 and / or the electrical load 106.
  • the dashed line from the control unit 102 to the electrical load 106 shows that this manipulated variable is optional.
  • the current consumption I V can be controlled alternatively or in addition to the recording current I L or the output current I A of the switching regulator 104.
  • Fig. 2 shows a field device 10 according to another embodiment of the invention.
  • the field device 10 has an input protection circuit 101, a switching regulator 104, an energy storage 105 and an electrical load 106.
  • the control unit 102 is in Fig. 2 implemented by means of the current sensing resistor R 201 and the operational amplifier 202.
  • the input current I E is passed through the input protection circuit and the current sensing resistor 201, wherein at the current sensing resistor 201 through the flowing through input current I E, the voltage U R drops.
  • the operational amplifier 202 is operable with the voltage U R as the input voltage and is connected to the switching regulator 104 so that an output signal of the operational amplifier 202 is fed to the switching regulator 104, that the switching regulator 104 the receiving current I L or the output current I A in dependence the output signal of the operational amplifier 202 can adjust so that the input current I E also changed.
  • the following relationship applies: With increasing input current I E , for example by an increasing charging current I L , the voltage U R at the current sensing resistor R 201 increases and consequently the output signal of the operational amplifier 202, which led to the switching regulator 104 becomes.
  • the increased output signal of the operational amplifier 202 causes in the switching regulator 104, that the recording current I L or the output current I A is lowered, which has a reduction of the input current I E result, so that the Voltage U R at the current sensing resistor R 201 also decreases, which in turn has an adaptation of the output signal of the operational amplifier 202 result.
  • the operational amplifier 202 can both be switched so that an output signal of the operational amplifier 202 proportional, as well as inversely proportional to the voltage U R behaves.
  • the switching regulator 104 may be configured to adjust a pick-up current I L as described above and described below.
  • a setpoint for the input current I E can be specified, the setpoint for the input current I E indirectly via the specification of a reference voltage, with which the voltage U R is compared takes place.
  • the specification of the desired value can be made via a control unit.
  • the operational amplifier 202 can also supply its output signal to the electrical load 106, wherein the electrical load 106 can be designed so that this output signal of the operational amplifier 202 as a control variable for adjusting the operation of the electrical load and thus the power consumption and the current consumption I V can be used.
  • the adaptation of the operation of the electrical load as described above and below, can be done in particular by a Data acquisition rate for the measured values is changed or energy-intensive computing and evaluation operations are optionally performed.
  • the power consumption of the electrical load can be reduced as described above and in the following, if the data acquisition rate is lowered and / or energy-intensive computation and evaluation operations are not performed or performed only to a reduced extent.
  • the reduction of the data acquisition rate can be stepped or stepless.
  • FIG. 12 shows a flow chart of a control method 300 useful for understanding the invention.
  • the current of the power supply P 1 is measured with an ammeter 301 and serves as an input value for the current control 303.
  • a voltage value measured with the voltmeter 302 serves as an input value for the voltage control 304.
  • About the so regulated power supply of the energy storage 105 is charged.
  • Fig. 4a shows a field device 401 according to an embodiment of the invention.
  • the field device 401 has an input protection circuit 101, a charging current control device 100, a charging circuit 420 and an energy storage 105. Furthermore, the field device 401 has a fill level sensor 404 and an evaluation unit 410. Of course, the field device 401 may also include a plurality of level sensors 404 and a plurality of evaluation units 410.
  • the charging current control device 100 regulates the charging current for charging the energy accumulator 105 so that the sum of the charging current and a current consumption the level sensors 404 and the ⁇ usnapsussien 410 does not exceed the maximum allowable value of an input current of the field device.
  • the field device 401 can also be spatially separated from the fill level sensors 404, wherein the fill level sensors 404 can transmit the measured values wirelessly or by wire to the evaluation units 410.
  • Fig. 4b shows a field device 402 according to another embodiment of the invention.
  • the field device 402 has an input protection circuit 101, a charging current regulating device 100, a charging circuit 420, an energy store 105, a pressure sensor 405 and an evaluation unit 410.
  • the field device 402 may also have a. Have a plurality of pressure sensors 405 and a plurality of evaluation 410.
  • the charging current control device 100 can be used in all field devices 10, 401, 402, 403 as described above and in the following, both the charging current for the energy storage 105 and the current consumption of the electrical consumer, for example the sensors 404, 405, 406 and the evaluation unit 410, to regulate.
  • Fig. 4c shows a field device 403 according to another embodiment of the invention.
  • the field device 403 has an input protection circuit 101, a charging current regulating device 100, an energy store 105, a charging circuit 420, a flow sensor 406 and an evaluation unit 410
  • the charging circuit 420 as described above and below, together with the switching regulator 104, is used to supply the energy store 105 with charging current.
  • a field device may also have different sensors, for example a pressure sensor, a flow sensor and a fill level sensor.
  • the measured values of the sensors can be detected, processed and reported further by an evaluation unit 410 as well as by a plurality of evaluation units 410.
  • Fig. 5 shows a method 500 useful for understanding the invention for controlling a charging current.
  • a first step 501 the detection of an input current I E takes place .
  • the rules of a charging current I L follows, where the sum of the charging current I L and a current consumption I V of an electrical load to the input current I corresponds to E of a field device generally and the input current I E of a field device does not exceed a predeterminable limit value.
  • the current consumption I V of an electrical load is regulated, so that the input current I E of a field device does not exceed a maximum value.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
EP11164940.6A 2011-05-05 2011-05-05 Feldgerät mit einer Ladestromregelungsvorrichtung Active EP2521241B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP11164940.6A EP2521241B1 (de) 2011-05-05 2011-05-05 Feldgerät mit einer Ladestromregelungsvorrichtung
US13/454,633 US8928285B2 (en) 2011-05-05 2012-04-24 Charging of secondary cells (accumulators) with regulated input current
CN201210139229.4A CN102810887B (zh) 2011-05-05 2012-05-07 利用已调节输入电流的二次电池（蓄电池）的充电

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11164940.6A EP2521241B1 (de) 2011-05-05 2011-05-05 Feldgerät mit einer Ladestromregelungsvorrichtung

Publications (2)

Publication Number Publication Date
EP2521241A1 EP2521241A1 (de) 2012-11-07
EP2521241B1 true EP2521241B1 (de) 2014-05-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11164940.6A Active EP2521241B1 (de) 2011-05-05 2011-05-05 Feldgerät mit einer Ladestromregelungsvorrichtung

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US (1) US8928285B2 (zh)
EP (1) EP2521241B1 (zh)
CN (1) CN102810887B (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014011717B4 (de) * 2014-08-06 2021-11-18 Abb Schweiz Ag Verfahren und Vorrichtung zur eigensicheren, redundanten Stromversorgung von Feldgeräten
CN104539004B (zh) * 2014-12-09 2017-07-11 惠州Tcl移动通信有限公司 保护充电的移动终端及其方法
JP6864536B2 (ja) 2017-04-25 2021-04-28 株式会社東芝 二次電池システム、充電方法、プログラム、及び車両
DE102018205111B3 (de) * 2018-04-05 2019-05-02 Vega Grieshaber Kg Messgerät mit Energiemanagement

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GB1319143A (en) * 1970-10-17 1973-06-06 Gen Battery Corp Electrical current supply circuit
CN2186968Y (zh) * 1993-11-11 1995-01-04 江志成 光能充电智能型电池充电控制装置
JP3368124B2 (ja) * 1995-10-26 2003-01-20 キヤノン株式会社 過充電防止回路
US6950950B2 (en) * 2001-12-28 2005-09-27 Hewlett-Packard Development Company, L.P. Technique for conveying overload conditions from an AC adapter to a load powered by the adapter
FR2842359B1 (fr) * 2002-07-11 2004-08-27 Cit Alcatel Dispositif de protection perfectionne, a circuits 1s, pour un ensemble de batterie de generateurs electrochimiques
US7199558B2 (en) * 2003-07-22 2007-04-03 Intersil Americas Inc. AC-DC adapter interface and battery charger having high speed battery charger current foldback when adapter current demand exceeds prescribed limit
DE102005062422A1 (de) * 2005-12-27 2007-07-05 Vega Grieshaber Kg Schaltkreis-Anordnung mit Exschutz
US20110148357A1 (en) * 2008-01-03 2011-06-23 Sheng-Fu Lu Battery charger base capable of connecting external AC power
DE102008062815B4 (de) 2008-12-23 2011-07-14 Samson Ag, 60314 Feldgerät für eine prozesstechnische Anlage und Verfahren zum Versorgen des Feldgeräts
US8467907B2 (en) * 2009-01-17 2013-06-18 Certus Process Solutions Automated valve with self-contained valve actuator system
US8552588B2 (en) * 2009-11-05 2013-10-08 Tai-Her Yang Battery charging coaction and output system with current limit supply
US9130376B2 (en) * 2010-04-23 2015-09-08 Psion Inc. System and method for externally controlling the charging of a battery powered device
EP2418556B1 (de) * 2010-08-12 2014-02-12 VEGA Grieshaber KG Internetbasiertes Füllstandmesswert- und Diagnoseinformationsabfragesystem und entsprechendes Verfahren

Also Published As

Publication number Publication date
EP2521241A1 (de) 2012-11-07
US8928285B2 (en) 2015-01-06
CN102810887A (zh) 2012-12-05
CN102810887B (zh) 2016-08-03
US20130106358A1 (en) 2013-05-02

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